1-4×(1/12+1/20)-(1/20+1/15)X=0
1个回答
1-4×(1/12+1/20)-(1/20+1/15)x=0
(1/20+1/15)x=1-1/3-1/5
7/60 x=7/15
x=7/15×60/7
x=4
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